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Mirrors > Home > ILE Home > Th. List > nfs1v | GIF version |
Description: 𝑥 is not free in [𝑦 / 𝑥]𝜑 when 𝑥 and 𝑦 are distinct. (Contributed by Mario Carneiro, 11-Aug-2016.) |
Ref | Expression |
---|---|
nfs1v | ⊢ Ⅎ𝑥[𝑦 / 𝑥]𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hbs1 1911 | . 2 ⊢ ([𝑦 / 𝑥]𝜑 → ∀𝑥[𝑦 / 𝑥]𝜑) | |
2 | 1 | nfi 1438 | 1 ⊢ Ⅎ𝑥[𝑦 / 𝑥]𝜑 |
Colors of variables: wff set class |
Syntax hints: Ⅎwnf 1436 [wsb 1735 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1423 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-11 1484 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-sb 1736 |
This theorem is referenced by: nfsbxy 1915 nfsbxyt 1916 sbco3v 1942 sbcomxyyz 1945 sbnf2 1956 mo2n 2027 mo23 2040 mor 2041 clelab 2265 cbvralf 2648 cbvrexf 2649 cbvralsv 2668 cbvrexsv 2669 cbvrab 2684 sbhypf 2735 mob2 2864 reu2 2872 sbcralt 2985 sbcrext 2986 sbcralg 2987 sbcreug 2989 sbcel12g 3017 sbceqg 3018 cbvreucsf 3064 cbvrabcsf 3065 disjiun 3924 cbvopab1 4001 cbvopab1s 4003 csbopabg 4006 cbvmptf 4022 cbvmpt 4023 opelopabsb 4182 frind 4274 tfis 4497 findes 4517 opeliunxp 4594 ralxpf 4685 rexxpf 4686 cbviota 5093 csbiotag 5116 isarep1 5209 cbvriota 5740 csbriotag 5742 abrexex2g 6018 abrexex2 6022 dfoprab4f 6091 finexdc 6796 ssfirab 6822 uzind4s 9385 zsupcllemstep 11638 bezoutlemmain 11686 cbvrald 12995 bj-bdfindes 13147 bj-findes 13179 |
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